(19)
(11) EP 2 392 931 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
29.10.2014 Bulletin 2014/44

(43) Date of publication A2:
07.12.2011 Bulletin 2011/49

(21) Application number: 11004552.3

(22) Date of filing: 03.06.2011
(51) International Patent Classification (IPC): 
G01R 19/00(2006.01)
G01R 1/02(2006.01)
G01R 27/02(2006.01)
 G01R 1/20(2006.01)
G01R 35/00(2006.01)
(84) Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated Extension States:
BA ME

(30) Priority: 04.06.2010 US 351600 P

(71) Applicant: Linear Technology Corporation
Milpitas, CA 95035-7417 (US)

(72) Inventors:
  • Irmer, Frank
    80469 Munich (DE)
  • Engl, Bernhard
    83071 Stephanskirchen (DE)

(74) Representative: Müller-Boré & Partner Patentanwälte PartG mbB 
Friedenheimer Brücke 21
80639 München
80639 München (DE)

   


(54) Dynamic compensation of aging drift in current sense resistor


(57) A current sense resistor circuit may include a primary current sense resistor that drifts with age. A secondary current sense resistor may drift with age in substantial unison with the primary current sense resistor. A calibration resistor may not drift with age in substantial unison with the primary current sense resistor. A compensation circuit may compensate for aging drift in the resistance of the primary current sense resistor based on a comparison of the calibration resistor with the secondary current sense resistor. The secondary current sense resistor may be in parallel with the primary current sense resistor, except when the compensation circuit is comparing the calibration resistor with the secondary current sense resistor.







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